void authenticateDH(String us, String pw) throws Exception {
long key = dh.createEncryptionKey(dh_resp);
DesCipher des = new DesCipher(DH.longToBytes(key));
byte user[] = new byte[256];
byte passwd[] = new byte[64];
int i;
System.arraycopy(us.getBytes(), 0, user, 0, us.length());
if (us.length() < 256) {
for (i = us.length(); i < 256; i++) {
user[i] = 0;
}
}
System.arraycopy(pw.getBytes(), 0, passwd, 0, pw.length());
if (pw.length() < 64) {
for (i = pw.length(); i < 64; i++) {
passwd[i] = 0;
}
}
des.encryptText(user, user, DH.longToBytes(key));
des.encryptText(passwd, passwd, DH.longToBytes(key));
os.write(user);
os.write(passwd);
readSecurityResult("VNC authentication");
}
void authenticateVNC(String pw) throws Exception {
byte[] challenge = new byte[16];
readFully(challenge);
if (pw.length() > 8) pw = pw.substring(0, 8); // Truncate to 8 chars
// Truncate password on the first zero byte.
int firstZero = pw.indexOf(0);
if (firstZero != -1) pw = pw.substring(0, firstZero);
byte[] key = {0, 0, 0, 0, 0, 0, 0, 0};
System.arraycopy(pw.getBytes(), 0, key, 0, pw.length());
DesCipher des = new DesCipher(key);
des.encrypt(challenge, 0, challenge, 0);
des.encrypt(challenge, 8, challenge, 8);
os.write(challenge);
readSecurityResult("VNC authentication");
}